<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>DEMO001</title>
<link rel="stylesheet" type="text/css" href="second.css"/>
</head>
<body>
<div id="total">
<div id="head">
<div id="name">
DEMO
</div><!-- name -->
<div id="btn1" title="主页"></div>
<div id="btn2" title="网站信息" onclick="window.open('third.html','_self')"></div>
<div id="btn3" title="标题3"></div>
<div id="btn4" title="登陆页面" onclick="window.open('demo.html','_self')"></div>
</div><!-- head -->
<div id="photo">
<div id="photo1"></div>
<div id="photo2"></div>
<div id="photo3"></div>
<div id="photo4"></div>
</div><!-- photo -->
</div><!-- total -->
</body>
</html>